Electric heater.



No. 67I,I39. Patented Apr. 2, I901. A. R. LEASK.

ELECTRIC HEATER.

Application filed Dec. 13, 1900.,-

(No Model.)

UNITED STATES PATENT Genres.

. 'ALE'XAN DER RITCHIE LEASK, OF LONDON, ENGLAND, ASSIGNOR OF ONE- HALF TO PERCY MORGANv BELLIS, OF SAME PLACE.

' ELECTRIC HEATER.

SPECIFICATION formingpart of Letters Patent N 0. 671.139, dated April 2, 1901.

Applicationfilad December 13, 1900. Serial No. 39,609. (No model.)

' trio Heaters, of which the following is a speci- The object of this invention is to provide a simple, cheap, h'andy,'and. efficient device for heating comparatively smallquantities of liquids by means of an electric current.

I The apparatus is complete in itself, and therefore does not require to be fitted to any particular vessel,'but may be indiscriminately used in any ordinary vessel or receptacle, such a tea or coifee pot, kettle, breakfastcup, tumbler, shaving-mug, foot-Warmer, or any other vessel or receptacle of similar dimensions. The device can he quickly inserted into or withdrawn from such vessel or receptacle.

The apparatus is so constructed that it will automatically switch on the electric current when inserted in the vessel and switch the current oif when withdrawn.

The invention is fully illustrated in the ac companying drawings, in which like letters of reference indicate corresponding parts in each of the several figures.

Figure l is a side elevation of my improved electric heating device; Fig. 2-, a sectional view, on a reduced scale, on the line y y in Fig. 1, in addition showing a vessel in sectional View, in which the apparatus is inserted for the purpose of heating the liquid contained therein; Fig.3, a sectional view on the line a; 00 of Fig. l; and Fig. at, an under side plan view of the head or crown piece, showing the arrangement of contacts for switching the current on or off.

In said drawings, a to represent rings, made of'slate, porcelain, clay,or other suitable nonconductor of heat and electricity and which is capable of withstanding the continuous action of heat and moisture. Said rings are made of a size suited to the vessels in which the apparatus is to be used, and their section may be circular, rectangular, triangular,elliptical, or any other regular or irregular figure. In the outer edges of said rings are formed a series of notches b b, the size and pitch of which may be regulated by the size and quantity of the wire that is to be used, as hereinafter set forth.

by which latter the current is conveyed to the heater, or with the vessel in which the apparatus may be used.

9 is a terminal connected to the conductor e, and h is a spring-contact strip on the lower side, of the headpiece, so arranged that one end of it stands out clear of the crown or head piece, but when pressed it makes contact with the terminal g. The lower face of this contact-strip is covered with insulating material 7L, so thatit cannot convey the electric current to any metal vessel in which the apparatus may be used.

j andj are two metal rods which connect the rings to the headpiece, the same being secured therein by nuts, as clearly shown. The rod j is in electrical connection with the spring-contact 72,, and the rod] is in direct electrical connection with the conductor f.

7; are insulating distance pieces or tubes separating the rings a a.

l is a fine wire wound many times around the rings, as shown, and entering the notches I), which prevent contactaud shortcircuiting of the individual coils. Ohe end of this wire is connected to the rody and the other to the rod j. So long as the apparatus is not in use current cannot pass through the coil i, because the swing-contact h will be clear of the terminal g; but when the apparatus is insertapparatus is lifted out of the veseehthe springccnteict is in'imeditttely released and breaks the circuit, thus stopping the dew of current, as will be manifest.

The conductors e and f may receive their current from any suitable source.

l do not intend to limit myself to the precise construction shown and described, as verions alterations can be made without changing the ecope of my invention; but

What I claim as new, and desire to secure by Letters Patent, is

. 1-. In an electric heater, the combination with a ring formed of a non-conductor of heat and electricity, of a. thin wire coil wound :tronnd said ring, a headpiece, metal rods connecting seid ring with the heedpiece,"electric conductors forcommuniceting current to said wire coil, and a spring-contact underneath the headpiece and edeptedto be ectueted to close the circuit through the heater by e portion cf the vessel into which the ie placed, snhetentiellyee described.

2. In an electric heater, the conihinetion with a. ring fornied'oi e eon'conductor of heat end electricity and provided with notches or corrugetionsinits edge or periphery, of b thi a wire coil wound eroend said ring and having its individual coils eepernted try said notches, at headpiece, metel rode connecting said ring to the headpiece, electric conductors for conimunicating current to said wire coil, and 2t epringpconteet underneath the headpiece and adapted to be actuated to close the circuit through the heater bye portion'of the vessel into which thoehpnretee is pieced, SllbStitl'b tielly as described.

3. in an electric heater, the combination with e ring formed of at non-conductor of heat and electricity, of aiiliin Wire coil Wound around said ring, a headpiece, metal rods so pending said ring from the headpiece and electrically connected with the wire coil, a. terminal on the under side of the headpiece, a spring-contact likewise arranged on the under side of the heedpiece'end electrically connected with one of the metal rods and in close proximity to the terminal, and electric condoctors connected with the other metal rod.

and the terminal respectively, said springcontect being; adapted to be actuated to close the circuit through the lie-Liter by a portion of the vessel in to which the apparatus is placed,

5. in an electric heater, the combinatioif with a thin wire coil, electric conductors for communicating current to said wire coil, means for suspending snid Wire coil from a. vessel into which it is adapted to be pleced, and 2t spring-contact to be actuated to close the circuit through the heater by :t portion .of said vessel, substantially as described.

ln'witness whereof I have hereunto set my hand in presence of two witnesses.

AL CXANDER RITCHIE LEASK. lViti'iesees:

HERBERT. STEWART, ERNST LAPPERT. 

